Parallax Power Supply ALS 20 Owner's Operation Manual

GENERAL INFORMATION
The Parallax Power Supply ALS 20 automatic load shed is designed to
automatically switch off a secondary load in a high current situation. This allows
for the connection of two high current devices to a single 20-amp breaker. Often,
the job of the ALS 20 has been performed by a manual device selector switch.
Typically the ALS 20 will be configured so that when the on demand current is at a
very high level the ALS 20 will automatically shed, or disconnect a secondary load
such as a water heater whose operation can be temporarily postponed without
directly affecting the user. This situation would normally occur by activating a high
current on-demand device such as a microwave or hair dryer. In addition the ALS
20 may also be installed to allow for the operation of more than 2 thermostatically
controlled devices on a 120V 30AMP service, as per the NEC 551-42(c). After the
current demands drop on the circuit, and a short safety delay the ALS 20 will
automatically switch the disconnected load back on.
Refer installation and servicing of this product to qualified service personnel.
Technical or service information is provided solely for use by licensed
electricians and certified RV technicians. No endorsement of technical expertise
is expressed and/or implied. User assumes all liabilities arising from use of this
information.
OPERATION
After the ALS 20 unit is installed, using one of the typical installations shown in this
manual, it will be ready for years of trouble-free service. Operation is automatic and
no maintenance is required.
TYPICAL INSTALLATIONS
WIRING INSTRUCTIONS
CAUTION:
Observe the polarity and torque specifications per the installation label included
on the inside cover of each unit.